The distribution of systolic blood pressures for female diabetics between the ages of 30 and 34 have unknown mean?

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The distribution of systolic blood pressures for female diabetics between the ages of 30 and 34 have unknown mean. However, the standard deviation is σ = 11.8 (Systolic). A random sample of one hundred women is chosen from this population. The mean systolic blood pressure for the sample is =130mmHG. Calculate a two-sided 95% confidence interval for the population mean.